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Lady_Fox [76]
2 years ago
8

If 4x-5y=6 and xy=8 then find the value of 16x^2+25y^2​

Mathematics
1 answer:
Anit [1.1K]2 years ago
6 0

Answer:

Hello,

356

Step-by-step explanation:

4x-5y=6\\xy=8\\\\(4x-5y)^2=16x^2+25y^2-40xy\\\\\\16x^2+25y^2=(4x-5y)^2+40xy=6^2+40*8=356\\

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Answer:
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work:
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combine like terms (-2x -18x). -20x - 3 = -2
subtract 3 from both sides to isolate the variable. -20x = -5 
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now that we know the value of x, it'll be easy to find Y.
Plug it in to the first equation.
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